QUESTION 19 I mated a pinkfoot fly and a wildtype fly, and obtained the followin
ID: 215820 • Letter: Q
Question
QUESTION 19 I mated a pinkfoot fly and a wildtype fly, and obtained the following F1 offspring. 55 pinkfoot,51 wildtype. Given only this information, which of the following could be the genotypes of the parents? (choose all that are possible) p/p x ++ p/p x p/p QUESTION 20 Then I mate two of the pinkfoot F1s to obtain the following F2s: 105 wild type (54 males, 51 females), 199 pink (98 males, 101 females) Which is dominant, pink or wildtype? O pink O wildtype can't tel QUESTION 21 When I compare the offspring ratio above to a 3 pink :1 wildtype expected ratio in a chi square test, how many degrees of freedom do I have?Explanation / Answer
As per Mendelian Laws of Inheritance (Segregation, Independent Assortment and Dominance), we get:
ANSWER 19
The F1 offsprings show a 1:1 phenotypic ratio
p/+ x +/+
p/p x p/+
ANSWER 20
In the F2 generation, there are more pinks than wild-types and equally so for both genders, hence:
Pink
ANSWER 21
Since there are two possible traits: wild type and pink, hence the degrees of freedom we have is:
2